Problem

How to send , (comma) as event attribute value

Resolution

You need to protect character. This will be different on Windows and Unix. Following are example for both type of OS:

If UA on Windows:
%TRKUT% SendEvent OBJNAME=<TO_Name>, <Attribute_name>="""XY,D""", CONFIG=%TRKCONF%

If UA on Unix:
$TRKUT SendEvent OBJNAME=<TO_Name>, <Attribute_name>='"XY,D"', CONFIG=%TRKCONF%